Improvement in furnace-grates



L. STERNBERG'ER. Furnace-Grate.

, N0.-221,123. Patented ct.'28,1879.

N. PETERS, PHOTO-LITHOGRAPHm WASHINGTON D. C

UNITED SrArEsPArENT OFFICE,

LnoPoLDs'rnaNEneEn, or PHILADELPHIA, PENNSYLVANIA.

IMPROVEM ENT IN FU RNACE-G RATES.

Specification forming part of Letters Patent No. 221,123, dated October4 28, 1879; application led April 8, 1879.

To all whom it may concern:

Be it known that I, LEOPOLD STERNBER- GER, of Philadelphia, Pennsylvania, have invented a new and useful Improvement in Furnace-Grates, of which the following is a speciicat-ion.

The object of my invention is to prevent, to a great extent, the warping or bending of the grate-bars of a furnace, or the distention of the walls of the furnace due to the expansion of the grate-bars when Aheated; and this object I attain in the manner which I will now proceed to describe, reference being had to the accompanying drawings, in which- Figure l is a sectional view of sufficient of a furnace to illustrate my invention; Fig. 2,21. sectional plan view, and Figs. 3 and 4 detached perspective views.

A is the front wall of the furnace; B B, the side Walls; D, the bridge Wall, and E the grate-bars, the latter being furnished at t-he rear ends with hooked projections a, which are adapted to a bar, b, extending transversely across the furnace beneath the grate. The front ends of the bars of the grate are beveled,as shown in Figs. 1 and 4, and bear against the correspondingly-beveled rear edge of a grating, F, the front edge of which is also beveled, and bears against the beveled face of a plate, d, secured to or formin g partof the front wall,

y A, ofthe furnace.

The front ends of the grate-bars are supported by a transverse rod, e, so that said bars are free to expand longitudinally, the effect of such expansion, owing to the beveled edges of the grating F, being to elevate such grating to an extent commensurate with the degree of expansion of the grate-bars, the grating resnming its former position when the barshave contracted to their normal length.

The grating Fis made in sections, oneof which is shown in perspective at Fig. 3, so that when a part of the grating becomes burned out or otherwise defect-ive, said part may be renewed without necessitating the re newal of the entire grating.

The lugs i on the grate-bars have opposite beveled edges,as shown in Fig. 1, for the pur pose of facilitating the passage of ashes through the gra-te, and for permitting the access of air to all parts of the bed of fuel on said grate, and the connections m between the ends of the bars which constitute the grating F havetheir kinner edges beveled for the same reason.

The invention may be applied to circular grates, if desired, the grating F in such case being made in the form of a ring which surrounds the main grate.

In some cases a plate may be substituted for the grating F; but the latter, is of course preferred.

I claim as my invention- 1. The combination ot' the grate, having bars E, with beveled ends, the beveled plate d, and a plate or grating, F, having beveled edges adapted to the ends of the grate-bars and to the plate d, all substantially as specified.

2. The combination of the grate E and the plate d with a plate or grating, F, made in sections, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

LEOPOLD STERNBERGER.

Witnesses t WILLIAM J. COOPER, HARRY SMITH. 

